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Mastech M840D Operation Manual page 5

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6)
7)
8)
Ei$er
one
of tfre
test leads should
h
taken
offfrom
he
circuit
under
test
w,len changing
he
test ranges.
lb
avoi'c
eledrical shock
or
damage
tb
üle meter; Do
not
apply msre
then
500v
between any
terminal
and
eartrr
gn:und.
-
r
t-.1
To avoid elecfrical shock, use caution wñen
rarcrking
above
60wc
or
25VAC
rms,
such voltage
po$e a
shock
hazard.
9)
when
finished
the
measurernent, switch off
the pou€r. Be
sure to
rcmüve the
battery
when
it
is not used
for
a
long
time to avoid leakage
problem.
10)
Do
not
tamperwih
flre ciranitry to avoid
damage.
11)
Do not use or store the'instrunrent
in
a
plae
of direct sunlight,
hlgh
ternperature and
high humidrty
5.
-MEIHOD
OF
TFTEASURTN¡CrIT
5.1
DCV
&
ACV
MEASUREMENT
1)
set the Function
range swttch at
the
required position.
2)
CCInnect
black
tmt
bad to
'CCIM" terminal
and
red te$t lead to
tre
'VIOHM"
input
tenninal.
3)
Conned
test leads to
measuring
point
and
read the display
value üre
polarfu
of üre
red lead
mnnedion
will
be
indicated at
the sarne
t¡me
ii
the
vofhge.
Noüe:
a)
b)
c)
Never try
to
measure the voltage
above
1000v1
Alfrough
he
indication is
pssible
t'0
show, there is
a
danger
of
darnaging
the
internalcircuitry.
5;2 DGA
&
ACA
MEASUREMENT
1)
Connmt
the black test lead to the "COM" terminal and
fre
rcd test
'
lead
to "A'
terminal for
a
rnaximum of 0.5A (mqdel Mg40D
**¡*u*
2A)
2\
set fre
function range switdr
at
tlre
requird
position.
3i
Conned
test leads
to
measuring
poinh
and read
fre
display
value.
The
polanly at
the
red
test
lead
mnnedion
will
be
indicated
ait
tne sarne
time
as
the cunent.
l!
the
volbge to be
tested
is
unknown
beforehand,
set
the
-fqnction{anüe
switch to
fre
highest range and
r¡¡crk dovur.
]n{.en
only
the
figure "1"
ir
displayed-over rangq
is
being
indicated
and the
func{ion range switc*l
should ne set
to
á
higher range.

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